Abstract

The design of library electronic door has been realized based on barcode and microcontroller AT89S51. The design can be use by the members of library to make integrating
database and simply visitors who will entrance to library.
The system consist of electronic door, dc motor driver circuit, LCD circuit, the minimum system of microcontroller AT89S51, and series of RS-232 serial communication. The system will be working if the microcontroller receives input signal from Delphi through serial RS-232, then
microcontroller drives the electronic door and send a signal back to Delphi for the display condition when the door open and close. The system has been successful and realized. The system can make members does not need to open door manually. The electronic door will be opened for approximately three seconds if the membership card registered.